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In double-blind, placebo-controlled trials, daily application of GHK-Cu cream at 3% concentration for 12 weeks produced a 70% increase in skin collagen thickness as measured by ultrasound imaging, a 40% increase in skin elasticity, and visible reduction in fine lines and wrinkles
Guzovsky AB, Schafer NP, Wolynes PG, Ferreiro DU (2022) Localization of energetic frustration in proteins
To understand what it is, you first have to understand Human Growth Hormone (hGH)
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